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64 Exam-based calculations

IMT tool controls

When using the IMT tool, you can select the

following controls on-screen.

To trace IMT manually

In manually tracing IMT, the user defines the

location.

1 On a frozen 2D image, press the

CALCS key

2 From the calculations menu, select a

measurement name.

3 Select Edit on-screen, and then select Manual,

and then select Sketch.

A single caliper appears, and

Trace

appears next

to the measurement.

4 Do the following for the desired

adventitia-media boundary and then for the

lumen-intima boundary:

a Position the caliper at the beginning of the

boundary, and press the

SELECT key.

b Using the touchpad, mark points by moving

the caliper to the next desired point and

pressing the

SELECT key.

To make a correction, select Undo on-screen

or press the

BACKSPACE key to delete the last

segment.

c Press the

SET key to complete the trace line.

5 Save the calculation. (See “To save a

calculation” on page 47.)

To sketch IMT

The IMT sketch measurement involves two

user-defined sketch lines that you can adjust

manually.

1 On a frozen 2D image, press the

CALCS key

2 From the calculations menu, select a

measurement name.

3 Select Edit on-screen, and then select Manual.

A single caliper appears on-screen, and

Sketch

appears next to the measurement.

4 Do the following for the desired

adventitia-media boundary and then for the

lumen-intima boundary:

Control Description

Hide Use to check results. Hides the

measurement results and trace

line. Select Show to redisplay

them.

Move Repositions the tool horizontally

by several pixels. The upper key

moves the tool right, and the

lower key moves the tool left.

Width Adjusts the tool width by 1 mm.

The upper key increases the

width, and the lower key

decreases the width.

Edit Displays Smooth, Adven, and

Lumen.

Smooth Adjusts the IMT line smoothing.

Select Edit to display this

control.

Adven Adjusts the adventitia-media

line. The upper key moves the

line upward. The lower key

moves the line downward.

Select Edit to display this

control.

Lumen Adjusts the lumen-intima line.

The upper key moves the line

upward. The lower key moves

the line downward.

Each of the two IMT lines can be

adjusted independently.

Select Edit to display this

control.

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